| 摘要 |
PROBLEM TO BE SOLVED: To provide solid detergents having satisfactory mechanical strength in a dry state and shows high speed dissolution when introduced into water. SOLUTION: A solid detergent comprises (1) a group of detergent particles which release foams having a diameter of not smaller than 1/10 of the diameter of the particles from their inside when dissolved in water and have not less than 90% solubility ratio of the formula: solubility ratio (%)=[1-(T/S)]×100 (wherein S is a weight (g) of the group of particles; and T is a dry weight (g) of the particles of the aqueous solution remaining on the sieve obtained under the conditions shown below) when the particles are introduced into water of 5 deg.C and stirred under the conditions [i.e., the particles in an amount of 1 g are introduced into 1 L hard water (containing 71.2 mg CaCO3/L with a molar ratio of Ca to Mg of 7/3), and the resulting solution is stirred in a 1 L beaker (having an inner diameter of 105 mm) with a stirrer (having a length of 35 mm and a width of 8 mm) at 800 rmp] for 60 sec and then, put through a standard sieve (having an opening of 74μm) of JIS Z 8801. Also, the solid detergent comprises (2) a group of base granules containing a water insoluble inorganic substance, a water soluble polymer and salts for supporting a surface active agent and/or a group of particles which is a group of the base granules supporting a surface active agent thereon, and the base granules having a structure in which the water soluble polymer and/or the salts are more locally distributed in the neighborhood of the surface than in the inner part, and contains the same group of particles as (1).
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